DOI: 10.1615/TSFP8
WALL PRESSURE FLUCTUATIONS INDUCED BY COHERENT STRUCTURES IN TURBULENT PIPE FLOW
摘要
We extend the simple forcing-response model developed by McKeon & Sharma (2010) to predict the wall pressure field associated with coherent structures in turbulent pipe flow. Realistic coherent structures such as modulating packets of hairpin vortices arise from the superposition of a small number of the velocity response modes predicted by this model. The wall pressure fluctuations associated with these velocity response modes capture many features observed in laboratory experiments and DNS, such as the location of pressure minima beneath coherent structures, the near-circular aspect ratio of wall pressure fluctuations, and the discrepancy in the characteristic length scales associated with the streamwise velocity and wall pressure fluctuations.